Paint studies of parts, for instance a piece of land, a group of trees or things like that, but always in a way that people can understand these things in relation with the whole landscape, by adding behind that group of trees the air in a right tone color and thereby in connection with the trees... Furthermore studies of a whole, preferably very simple subjects - A meadow with horizon and a piece of air to examine further the general tone color, the harmony of the whole.... and study nature even more by thinking about it than working after it.